Dust collector



2 Shqets-Sheet '1 Nov. 17, 1925. v

F. A. LUNDQUIST DUST COLLECTOR Filed May 31 1924 Nov. 11, 1925- 1,562,352

F. A. LUNDQUIST DUST COLLECTOR Filed llay. 31. 192 2 Sheets-Sheet 2 wit/26.56 m a By any fizz/67%:

air comes to the collector.

Patented Nov. 17, 1925.

UNITED STATES FRANK A. LUNDQTJ'IST, CHICAGO, ILLINOIS.

DUST COLLECTOR.

Application filed May 31, 1924. Serial NO. 716,894.

To all whom it ma/g concern:

Be it known that I, FRANK A. LUND UIs'r, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Dust Collectors, of which the following is a specification.

My invention relates to dust collectors, and has for its object the production of a superior device for that purpose.

In the accompanying drawings- Fig. 1 is a longitudinal section;

Fig. 2 is an enlarged transverse section on line 2-2 of Fig. 1;

Fig. 3 is an elevation, on the same scale as Fig. 2, of the right hand end of Fig. 1; and

Fig. 4 is a plan of Fig. 3.

The main body of the dust collector is a rectangular casing made up of a series of sections or chambers secured together. In Fig. 1 there are shown three such sections, A, B and C secured together by flanges at 11 and 12. The section A is connected at 13 to an intake pipe 14 thru which dust laden The sides of the casing are represented at 1.5 and 16, the top at 17, and the bottom at 18.

The section A, adjacent to the intake pipe 14, has a baffle plate 19 which extends across from side to side of the casing. This plate is inclined as shown so that dust laden air entering thru pipe 14 will move downward in the casing.

About the middle of the casing, or a little above, are a series of inclined plates 20 and a series of vertical plates 21. The last inclined plate 20 serves as part of the rear wall of section A, and the last vertical plate 21 is longer than the others. These plates are secured to the side walls, and the vertical ones are connected at the left to the in clined ones as shown. But at the right, each vertical plate is separated a short distance from its adjacent inclined plate. Thus, these plates provide a series of slots thru which air and dust may pass from the upper to the lower part of the casing.

Section B is substantially the same as section A. Its forwardwall 22 is connected to -wall 20 by flanges 11, and it has a baifie plate 23 similar to plate 19. The rear wall 24 of section B is connected to the front wall 25 of section C, and in section C is another baffie plate 26. From section C a pipe 27 extends to a drum 28. In sections B and C are plates 29 and 30, and 31 and 32, which are like plates 20 and 21in section A. The. slots between plates 29 and 30 are a little narrower than the slots between plates 20 and 21, and the slots between plates 81 and 32 are still narrower. In other words, there are tapering inclined slots between the upper and lower parts of the casing, those slots becoming narrower in'each section from the first to the last. Otherwise, the different sections are substantially the same. 1

Secured to the front and rear walls of the sections are bearings 33, and in these bearings is a shaft 34. Secured to this shaft. are arms 35 having on their ends forks 36 which project into the slots before mentioned. These forks fit loosely into the slots, and are for cleaning purposes. The shaft 34 is, in fact, a rock shaft, and is driven from power shaft 37 thru any convenient connections in standard 38. The movements of the rock shaft 34 may be very slow as the sole purpose of these things is to keep the slots free from deposits likely to choke them.

Connecting the top of the lower part of section A with the upper part of section B is a pipe 39 having a damper 40 therein.

For the other sections there are other pipes 41 and 42 which also have dampers therein. Their location and arrangement will be ob-' vious from an inspection of Fig. '1. There is a slow. upward flow of air thru these pipes.

Dust ladenv air flows inward thru pipe 14 and downward under baffle 19. As dust'is denser than air, it will tend to move down ward and pass thru the slots between plates 20 and 21, and air will tend to moveupward and pass in the direction of the arrow into section B. What occurs, however, is that air and dust travel in both directions, but there is a partial separation in section A so that more dust and less air move downward and more air and less dust move upward.

An inspection of the drawings will showthat the cross sectional area of section A above plates 20 is much greater than the area of the pipe 14 or the channel under baffle plate 19. As a consequence of this,

slows up in speed and more easily changes the direction of its movement. As a conse quence, much of the dust passes thru the slots between plates 20 and 21 into the lower part of section A.

The plates 20, 21 and 21 may be described as constituting a slotted or perforated partition which divides the section or chamber A into upper and lower parts. This partition is preferably located above the center of the section so that the lower part of the chamber is of larger size than the upper one. No more air can pass downward thru the slots in this partition than passes upward thru the pipe 39, and as the area of this pipe is less than the area of the channel between plates 22 and 28, it will be evident that air moves very slowly thru the lower chamber. Also, air enters section A and passes thru the upper chamber in an unobstructed and unbroken current, but it enters the lower chamber at low velocity thru a series of small openings. As a result, the lower chamber or compartment is a chamber of comparative quiet in which dust settles to the bottom The transverse area of the air channel between plates 22 and 23 is considerably less than the transverse areas of the spaces over the partitions in sections A and B. As a consequence, the air which enters rapidly under plate 19 moves slowly thru section A, is then speeded up and enters section B by rapid movement under plate 23, moves slowly thru section B, is again speeded up in passing under plate 26, and then moves slowly thru section C.

The slotted partitions made by plates 20 and 21, 29 and 30, and 31 and 32 are in the nature of traps for catching dust so that it will be conveyed to and be per: mitted to settle in the lower chambers or compartments of sections A, B and C. The air which travels thru the upper parts of these sections is speeded up in moving toward these traps and is retarded in moving away; The result is to precipitate the dust thru the slots into the lower compartments of the sections. Part of the air which entors the pipe 14 goes thru the slots into the lower part of section A and nioves much slower than air moves thru the upper part.

Stating this phase of the operation in other words, the dust laden air enters a section at comparatively high speed and then divided into two streams, one of which flows thru the upper part of the section at a slow speed, and the other of which flows thru the lower partof the sec tion at a very slow speed. And this is true for each one of the sections in turn. And in the lower parts of, each section are doors 43 for cleaning out the dust that settles therein.

From section 0 air flows thru pipe 27 to drum 28. In the walls of this drum are holes 44 thru which spraying nozzles may operate to remove the remainder of the dust in the air. From drum 28 air flows thru pipe 47 to exhaust fan IS. It is the operation of this fan which conveys air thru the collector. The lower end of chamber 4-6 projects into water in a receptacle 4:9, which water overflows at 50.

What I claim is:

1. In a device of the class described, a chamber having a horizontal partition provided with tapered slots inclined toward one upper corner of the chamber, an air intake connection at said upper corner, a plate arranged to direct the incoming air downward at an incline toward said partition, and a discharge connection at the opposite upper corner ot the chamber, said parts being so arranged that air flowing from the intake to the discharge will pass transversely over the slots in said partition.

In a device of the class described, a chamber provided with a perforated par-tition dividing the chamber into upper and lower parts, an inlet for the upper part so arranged that air entering thereat will flow over and partly thru the perforations in said partition, and air outlets for the upper and lower parts of said chamber, the outlet for the lower part being of less area than the outlet for the upper part.

3. A dust collector consisting of a series of chambers secured together, inlet and outlet'connections so that air may flow thru the chambers in succession, perforated partitions located below said connections and serving to divide the chambers into upper and lower compartments, and additional air channels of relatively small area connecting the lower compartment of a preceding chamber with the upper compartment of a succeeding chamber.

I; In a dust collector, a chamber thru which air flows, a partition dividing the chamber into upper and lower compartments and provided with slots thru which dust falls from the upper to the lower compartment, and cleaning devices arranged to be reciprocated in said slots.

5. In a dust collector, a chamber, a series of plates serving to form a slotted partition dividing said chamber into upper and lower compartments, connections for conveying dust laden air thru the chamber and in contact with the upper edges of said plates, and cleaning devices arranged to I 

